/* Giorgio Ingargiola (June 99)

   This directory shows an example of RPC use, where each RPC call
   is executed by a different thread in the server. 
   We show the use of locks to protect data shared by the
   remote procedures.

   The remote procedure are add and subtract, that return
   respectively the sum and the difference of two integers.
   On the server we assume that there is a shared integer,
   total, in which we store the sum of the results of all the
   calls. This shared variable is protected by a lock.
   To make it easier to have contention between calls of 
   concurrent clients, we have inserted a sleep period of two
   seconds during the execution of the remote procedures.

   FILES
     Makefile	The name says it all
     TAGS	File created by the command etag -t *.[ch]
		to allow me, when using emacs to get to the
		definition of symbols with ESC-.
     mc.x	XDR definition of the remote procedure interface.
		Written by developer.
		It is used with the command rpcgen mc.x
		to generate the files mc.h, mc_sdr.c, mc_svc.c
		[which we modify to mc3_svc.c], mc_clnt.c
     mc.h       Generated by rpcgen, c interface to remote
		procedures
     mc_xdr.c	Generated by rpcgen, functions to convert
		to/from xdr, i.e. worry about data representation
     mc_clnt.c	Generated by rpcgen, the client stub of the
		remote procedures
     mc3_svc.c  Modification done by developer of the file
		mc_svc.c generated by rpcgen - the skeleton
		on the server.
     mc3_svc_proc.c Written by developer, the implementation of the
		remote procedures on the server.
     mc.c       Writen by the developer, the main function of 
		the client. It calls the remote procedures
 */